Astudy is made of incomes among full-time workers age 25–54 in a certain town. a simple random sample is taken, of 250 people with high school degrees: the sample average income is $30,000 and the sd is $25,000. another simple random sample is taken, of 250 people with college degrees: the sample average income is $50,000 and the sd is $40,000. 1. is the difference in averages real, or due to chance?

Alake near the arctic circle is covered by a 222-meter-thick sheet of ice during the cold winter months. when spring arrives, the warm air gradually melts the ice, causing its thickness to decrease at a constant rate. after 333 weeks, the sheet is only 1.251.251, point, 25 meters thick. let s(t)s(t)s, left parenthesis, t, right parenthesis denote the ice sheet's thickness sss (measured in meters) as a function of time ttt (measured in weeks).

Asmall business produces and sells balls. the fixed costs are $20 and each ball costs $4.32 to produce. each ball sells for $8.32. write the equations for the total cost, c, and the revenue, r, then use the graphing method to determine how many balls must be sold to break even.

The amount spent on food and drink by 20 customers is shown below what is the modal amount spent ?